Chimney pit door



A. P. ROBINSON CHIMNEY PIT DOOR Oct. 9, 1951 Filed Nov. 18, 1946 .4TTOENE Y..S

Patented Oct. 9, 1951 UNITED STATES PATENT QF F ICE CHI'MNEY PIT noon Albert P. Robinson, Seattle, Wash. Application Nwember 18, 1946', Serial No. 710,535

' 2 Claims.

This invention relates. to improvements in seticles f thatkind which are known in the home building industry as chimney pit doors; such doors bein applied to the. openings provided at the lower end of the chimney of a' furnace or fireplace for the removal of ashes andin many .cases are located at the outside of the building.

It is, the principal object ofthis invention to provide a chimney pit door. and frame therefore that may be. set within the chimney wall and, by reason of. its novel details of construction, will overcome the undesirable features and disadvantages of present day doors for the same purposes that project from the wall. Furthermore, to provide a door frame structure that will serve to support the brickwork abovethe opening.

It' is also one of the principal objects of this invention to provide a frame and door. combinationincluding novel featuresfo'r holdingthe door securely in its closedposition; without the use of hinges or pin connections, and which permits ease and ready removal .of the door for clean out purposes.

Still another object of the invention is to provide a combination of door and frame that prevents waterdraining therethroughinto the chimney pit and overcomes the detrimental effects of such draining,

Yet another object of the invention is to provide a frame and door structure that can be manufactured at. a lesser cost thanlthat of the usual types, by reason of the elimination of difficult casting problems.

Still other objects of the invention are to be found in the details of construction and combination of parts embodied in the,-structure-,.and in the mode of use of the device, as will hereinafter be fully described.

In accomplishing these and other objects of the invention, I have provided the improved details of construction, the preferred forms of which are illustrated in the accompanying drawings wherein:

Fig. 1 is a perspective view of a chimney pit door structure embodied by the present invention.

Fig. 2 is a front view of the same with parts thereof broken away to reduce the size of the view and for better illustration of important details of construction.

Fig. 3 is a vertical section, taken on the line 33 in Fig. 2.

Fig. 4 is a similar sectional view illustrating the manner of shifting the door upwardly to release it for removal from its frame.

Fig. 5 is a horizontal section taken substantially on the line 55 in Fig. 3.

Referring more in details to the drawings:

The present structure comprises a frame portion and an independent door portion. The frame portion is of rectangular form. and it comprises 2' thetop and bottom rails, i and 2; and opposite (and rails 3 and 4; all rails being integrally cast of steel, or other suitable metal or material.

* As shown best in the cross sectional views of Figs. 3' and 4, the top rail comprises a fiat-horizon'tally extending portion upon which the brick Work that is directly above the opening my be supported. Along its forward edge and flush therewith, this rail has a depending flange I'm. The bottom rail 2, likewise, comprises a flat horizontally extending portion that rests flatly upon the brick work at the bottom of the opening" and this has an upwardly directed flange 2a: along its forward edge. The opposite end rails, 3 and 4, of theframe structure are set flush with the endsof the top and bottom rails and as shown in Fig. 5, are provided with integrally formed inwardly directed flanges 3x and 43: along their inner edges that are flush with the flange 2:12 but are inset from the plane of" the flange lic t'o-a slight extent as has been shown in Figs. 3-a'nd4. Also, the-flanges 3r and' lac are formedalong their inner longitudinal edges, at the front side; with longitudinal beads designated at 6,-whi'ch terminateat' their upper and lower ends short of" the rails l and 2, as will be understood by reference to the showing of the beads in Fig. 3.

The door [0 comprises a single piece, integrally cast member of rectangular form and equipped alon its top edge with an inwardly offset" and vertically directed flange l I adapted to be-received back of the outside flange lzc that depends from the forward" edge of the top rail I. Along its opposite sides,- the door I0 hasinwardly formed edge portions or flanges l2 that are designed to engage flatly against the outside surfaces of the flanges 3a: and 4a: of the end rails 3' and! out sid'e'of the beads 6, as shown best in'Fig. 5. Across the bottom of the door, there is a flat, vertically depending flange l3 that is designed to fit closely against the front face of the flange 2.1: of'the bottom rail 2 when the door is in its closed position, and formed on the door, at the inside thereof, near its lower edge and centrally between its ends, is an inwardly and downwardly directed tongue I5, adapted to extend over and to the inside of the flange 2m, to rest thereagainst as a means of retaining the door in a closed position; this being the position in which the door is shown in Fig. 3.

To facilitate the opening or removal of the door, it is formed centrally at its lower edge, and at the outside, with a handle lip l8.

It is shown in Figs. 3 and 4 that the main body portion of the door casting is outwardly formed. The boundries of this outwardly formed portion are inclined inwardly to various edge flanges. Thus there are no abrupt bends, or shoulders of a character that will catch dust and dirt, or retain water thereon. Water that door and the flat portion of top rail l to permit the door to be lifted upwardly and the tongue Hi to be disengaged from the lower flange 25s of the bottom rail 2. With the door so lifted, it may then be pulled outwardly at its lower edge and freed from the rail 2. Then the door may be slipped bodily downward to disengage the top marginal flange H from the top rail flange Ia: so that the door may be removed entirely from the frame structure. To replace the door, its top edge flange I l is first disposed back of the depending flange Ir of the bottom rail I, then is lifted upwardly so that the tongue may be passed over and engaged with the flange 2a: of the cross bar 2. The door then is lowered slightly and all parts are thereby brought tightly to closed position by the action of the tongue as engaged with the cross flange of the bottom rail 2. When closed, the door assumes the position shown in Fig. 3. It will be understood, that when the door is in this closed position, the depending flange lac substantially overlaps the top edge of the door. Also, that the vertical, side edge portions of the door engage tightly with the outside surfaces of the end rails 3 and 4 at the outside of the beads 6 thereon, and the lower edge flange of the door overlies the outside of the bottom rail 2. Thus, all joints are tightly closed and no leakage possible under ordinary conditions.

Structures of this character are desirable and advantageous for various reasons:'

First, the entire structure may be set within the opening of the brickwork so that the door lies within the front plane of the wall, thus to eliminate as much as possible the catching of dirt on the door.

Second, there are no projecting hinge parts or catches that are not only expensive to cast, but are dust catchers and not desirable.

Having thus described my invention, what I claim as new therein, and desire to secure by .Letters Patent is:

1. An ash pit door structure comprising in combination: a rectangular frame adapted for flange across its top edge adapted to be disposed back of the said depending flange and said door being adapted to be closely engaged along its opposite side edges and bottom edge with the front end surfaces of the opposite side and bottom railsof theframe and a tongue projecting inwardly and downwardly from the inside of the door to extend downwardly across and engage with the flange of the bottom rail of the frame for the support and securement of the door in closed position; there being clearance between the top edge of the flange at the top edge of the door and top rail permitting upward shifting of the door when in closed position for the disengaging of the .tongue from the flange of the bottom rail. p

2. A door as recited in claim 1 wherein the said opposite end rails of the frame have inturned flanges at their forward edges, in the same plane Of the flange of the bottom rail for the flat, engagement of the corresponding edge portions of the door thereagainst, and wherein the said tongue is medially of the side edges and adapted to engage over the said flange of the bottom rail and said flanges of the opposite end rails of the frame having beads formed along their inner edges at the outside, and said door having an outwardly formed body portion and inset edge flanges at opposite side edges to engage the opposite end rails at the outside of said beads.

ALBERT P. ROBINSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Denmark 1 1922 

